The spouse’s visa will be valid for 6 months from the date of issuance meaning, that the alien spouse must enter the US within 6 months of the visa issuance. Upon passing through immigration at his/her port of entry, the alien spouse will become a Permanent Resident of the United States and, what is known as an I-551 stamp will be placed in his/her passport as evidence of his/her permanent resident status until his/her Form I-551 (“green card”) is manufactured and mailed to him/her